add subtree-ish sources for 12.0.3

[ceph.git] / ceph / src / dpdk / drivers / net / pcap / rte_eth_pcap.c

/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
 *   Copyright(c) 2014 6WIND S.A.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <time.h>

#include <net/if.h>

#include <pcap.h>

#include <rte_cycles.h>
#include <rte_ethdev.h>
#include <rte_kvargs.h>
#include <rte_malloc.h>
#include <rte_mbuf.h>
#include <rte_vdev.h>

#define RTE_ETH_PCAP_SNAPSHOT_LEN 65535
#define RTE_ETH_PCAP_SNAPLEN ETHER_MAX_JUMBO_FRAME_LEN
#define RTE_ETH_PCAP_PROMISC 1
#define RTE_ETH_PCAP_TIMEOUT -1

#define ETH_PCAP_RX_PCAP_ARG  "rx_pcap"
#define ETH_PCAP_TX_PCAP_ARG  "tx_pcap"
#define ETH_PCAP_RX_IFACE_ARG "rx_iface"
#define ETH_PCAP_TX_IFACE_ARG "tx_iface"
#define ETH_PCAP_IFACE_ARG    "iface"

#define ETH_PCAP_ARG_MAXLEN     64

#define RTE_PMD_PCAP_MAX_QUEUES 16

static char errbuf[PCAP_ERRBUF_SIZE];
static unsigned char tx_pcap_data[RTE_ETH_PCAP_SNAPLEN];
static struct timeval start_time;
static uint64_t start_cycles;
static uint64_t hz;

struct queue_stat {
        volatile unsigned long pkts;
        volatile unsigned long bytes;
        volatile unsigned long err_pkts;
};

struct pcap_rx_queue {
        pcap_t *pcap;
        uint8_t in_port;
        struct rte_mempool *mb_pool;
        struct queue_stat rx_stat;
        char name[PATH_MAX];
        char type[ETH_PCAP_ARG_MAXLEN];
};

struct pcap_tx_queue {
        pcap_dumper_t *dumper;
        pcap_t *pcap;
        struct queue_stat tx_stat;
        char name[PATH_MAX];
        char type[ETH_PCAP_ARG_MAXLEN];
};

struct pmd_internals {
        struct pcap_rx_queue rx_queue[RTE_PMD_PCAP_MAX_QUEUES];
        struct pcap_tx_queue tx_queue[RTE_PMD_PCAP_MAX_QUEUES];
        int if_index;
        int single_iface;
};

struct pmd_devargs {
        unsigned int num_of_queue;
        struct devargs_queue {
                pcap_dumper_t *dumper;
                pcap_t *pcap;
                const char *name;
                const char *type;
        } queue[RTE_PMD_PCAP_MAX_QUEUES];
};

static const char *valid_arguments[] = {
        ETH_PCAP_RX_PCAP_ARG,
        ETH_PCAP_TX_PCAP_ARG,
        ETH_PCAP_RX_IFACE_ARG,
        ETH_PCAP_TX_IFACE_ARG,
        ETH_PCAP_IFACE_ARG,
        NULL
};

static struct ether_addr eth_addr = {
        .addr_bytes = { 0, 0, 0, 0x1, 0x2, 0x3 }
};

static const char *drivername = "Pcap PMD";
static struct rte_eth_link pmd_link = {
                .link_speed = ETH_SPEED_NUM_10G,
                .link_duplex = ETH_LINK_FULL_DUPLEX,
                .link_status = ETH_LINK_DOWN,
                .link_autoneg = ETH_LINK_SPEED_FIXED,
};

static int
eth_pcap_rx_jumbo(struct rte_mempool *mb_pool, struct rte_mbuf *mbuf,
                const u_char *data, uint16_t data_len)
{
        /* Copy the first segment. */
        uint16_t len = rte_pktmbuf_tailroom(mbuf);
        struct rte_mbuf *m = mbuf;

        rte_memcpy(rte_pktmbuf_append(mbuf, len), data, len);
        data_len -= len;
        data += len;

        while (data_len > 0) {
                /* Allocate next mbuf and point to that. */
                m->next = rte_pktmbuf_alloc(mb_pool);

                if (unlikely(!m->next))
                        return -1;

                m = m->next;

                /* Headroom is not needed in chained mbufs. */
                rte_pktmbuf_prepend(m, rte_pktmbuf_headroom(m));
                m->pkt_len = 0;
                m->data_len = 0;

                /* Copy next segment. */
                len = RTE_MIN(rte_pktmbuf_tailroom(m), data_len);
                rte_memcpy(rte_pktmbuf_append(m, len), data, len);

                mbuf->nb_segs++;
                data_len -= len;
                data += len;
        }

        return mbuf->nb_segs;
}

/* Copy data from mbuf chain to a buffer suitable for writing to a PCAP file. */
static void
eth_pcap_gather_data(unsigned char *data, struct rte_mbuf *mbuf)
{
        uint16_t data_len = 0;

        while (mbuf) {
                rte_memcpy(data + data_len, rte_pktmbuf_mtod(mbuf, void *),
                        mbuf->data_len);

                data_len += mbuf->data_len;
                mbuf = mbuf->next;
        }
}

static uint16_t
eth_pcap_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
        unsigned int i;
        struct pcap_pkthdr header;
        const u_char *packet;
        struct rte_mbuf *mbuf;
        struct pcap_rx_queue *pcap_q = queue;
        uint16_t num_rx = 0;
        uint16_t buf_size;
        uint32_t rx_bytes = 0;

        if (unlikely(pcap_q->pcap == NULL || nb_pkts == 0))
                return 0;

        /* Reads the given number of packets from the pcap file one by one
         * and copies the packet data into a newly allocated mbuf to return.
         */
        for (i = 0; i < nb_pkts; i++) {
                /* Get the next PCAP packet */
                packet = pcap_next(pcap_q->pcap, &header);
                if (unlikely(packet == NULL))
                        break;

                mbuf = rte_pktmbuf_alloc(pcap_q->mb_pool);
                if (unlikely(mbuf == NULL))
                        break;

                /* Now get the space available for data in the mbuf */
                buf_size = rte_pktmbuf_data_room_size(pcap_q->mb_pool) -
                                RTE_PKTMBUF_HEADROOM;

                if (header.caplen <= buf_size) {
                        /* pcap packet will fit in the mbuf, can copy it */
                        rte_memcpy(rte_pktmbuf_mtod(mbuf, void *), packet,
                                        header.caplen);
                        mbuf->data_len = (uint16_t)header.caplen;
                } else {
                        /* Try read jumbo frame into multi mbufs. */
                        if (unlikely(eth_pcap_rx_jumbo(pcap_q->mb_pool,
                                                       mbuf,
                                                       packet,
                                                       header.caplen) == -1)) {
                                rte_pktmbuf_free(mbuf);
                                break;
                        }
                }

                mbuf->pkt_len = (uint16_t)header.caplen;
                mbuf->port = pcap_q->in_port;
                bufs[num_rx] = mbuf;
                num_rx++;
                rx_bytes += header.caplen;
        }
        pcap_q->rx_stat.pkts += num_rx;
        pcap_q->rx_stat.bytes += rx_bytes;

        return num_rx;
}

static inline void
calculate_timestamp(struct timeval *ts) {
        uint64_t cycles;
        struct timeval cur_time;

        cycles = rte_get_timer_cycles() - start_cycles;
        cur_time.tv_sec = cycles / hz;
        cur_time.tv_usec = (cycles % hz) * 10e6 / hz;
        timeradd(&start_time, &cur_time, ts);
}

/*
 * Callback to handle writing packets to a pcap file.
 */
static uint16_t
eth_pcap_tx_dumper(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
        unsigned int i;
        struct rte_mbuf *mbuf;
        struct pcap_tx_queue *dumper_q = queue;
        uint16_t num_tx = 0;
        uint32_t tx_bytes = 0;
        struct pcap_pkthdr header;

        if (dumper_q->dumper == NULL || nb_pkts == 0)
                return 0;

        /* writes the nb_pkts packets to the previously opened pcap file
         * dumper */
        for (i = 0; i < nb_pkts; i++) {
                mbuf = bufs[i];
                calculate_timestamp(&header.ts);
                header.len = mbuf->pkt_len;
                header.caplen = header.len;

                if (likely(mbuf->nb_segs == 1)) {
                        pcap_dump((u_char *)dumper_q->dumper, &header,
                                  rte_pktmbuf_mtod(mbuf, void*));
                } else {
                        if (mbuf->pkt_len <= ETHER_MAX_JUMBO_FRAME_LEN) {
                                eth_pcap_gather_data(tx_pcap_data, mbuf);
                                pcap_dump((u_char *)dumper_q->dumper, &header,
                                          tx_pcap_data);
                        } else {
                                RTE_LOG(ERR, PMD,
                                        "Dropping PCAP packet. Size (%d) > max jumbo size (%d).\n",
                                        mbuf->pkt_len,
                                        ETHER_MAX_JUMBO_FRAME_LEN);

                                rte_pktmbuf_free(mbuf);
                                break;
                        }
                }

                rte_pktmbuf_free(mbuf);
                num_tx++;
                tx_bytes += mbuf->pkt_len;
        }

        /*
         * Since there's no place to hook a callback when the forwarding
         * process stops and to make sure the pcap file is actually written,
         * we flush the pcap dumper within each burst.
         */
        pcap_dump_flush(dumper_q->dumper);
        dumper_q->tx_stat.pkts += num_tx;
        dumper_q->tx_stat.bytes += tx_bytes;
        dumper_q->tx_stat.err_pkts += nb_pkts - num_tx;

        return num_tx;
}

/*
 * Callback to handle sending packets through a real NIC.
 */
static uint16_t
eth_pcap_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
        unsigned int i;
        int ret;
        struct rte_mbuf *mbuf;
        struct pcap_tx_queue *tx_queue = queue;
        uint16_t num_tx = 0;
        uint32_t tx_bytes = 0;

        if (unlikely(nb_pkts == 0 || tx_queue->pcap == NULL))
                return 0;

        for (i = 0; i < nb_pkts; i++) {
                mbuf = bufs[i];

                if (likely(mbuf->nb_segs == 1)) {
                        ret = pcap_sendpacket(tx_queue->pcap,
                                        rte_pktmbuf_mtod(mbuf, u_char *),
                                        mbuf->pkt_len);
                } else {
                        if (mbuf->pkt_len <= ETHER_MAX_JUMBO_FRAME_LEN) {
                                eth_pcap_gather_data(tx_pcap_data, mbuf);
                                ret = pcap_sendpacket(tx_queue->pcap,
                                                tx_pcap_data, mbuf->pkt_len);
                        } else {
                                RTE_LOG(ERR, PMD,
                                        "Dropping PCAP packet. Size (%d) > max jumbo size (%d).\n",
                                        mbuf->pkt_len,
                                        ETHER_MAX_JUMBO_FRAME_LEN);

                                rte_pktmbuf_free(mbuf);
                                break;
                        }
                }

                if (unlikely(ret != 0))
                        break;
                num_tx++;
                tx_bytes += mbuf->pkt_len;
                rte_pktmbuf_free(mbuf);
        }

        tx_queue->tx_stat.pkts += num_tx;
        tx_queue->tx_stat.bytes += tx_bytes;
        tx_queue->tx_stat.err_pkts += nb_pkts - num_tx;

        return num_tx;
}

/*
 * pcap_open_live wrapper function
 */
static inline int
open_iface_live(const char *iface, pcap_t **pcap) {
        *pcap = pcap_open_live(iface, RTE_ETH_PCAP_SNAPLEN,
                        RTE_ETH_PCAP_PROMISC, RTE_ETH_PCAP_TIMEOUT, errbuf);

        if (*pcap == NULL) {
                RTE_LOG(ERR, PMD, "Couldn't open %s: %s\n", iface, errbuf);
                return -1;
        }

        return 0;
}

static int
open_single_iface(const char *iface, pcap_t **pcap)
{
        if (open_iface_live(iface, pcap) < 0) {
                RTE_LOG(ERR, PMD, "Couldn't open interface %s\n", iface);
                return -1;
        }

        return 0;
}

static int
open_single_tx_pcap(const char *pcap_filename, pcap_dumper_t **dumper)
{
        pcap_t *tx_pcap;

        /*
         * We need to create a dummy empty pcap_t to use it
         * with pcap_dump_open(). We create big enough an Ethernet
         * pcap holder.
         */
        tx_pcap = pcap_open_dead(DLT_EN10MB, RTE_ETH_PCAP_SNAPSHOT_LEN);
        if (tx_pcap == NULL) {
                RTE_LOG(ERR, PMD, "Couldn't create dead pcap\n");
                return -1;
        }

        /* The dumper is created using the previous pcap_t reference */
        *dumper = pcap_dump_open(tx_pcap, pcap_filename);
        if (*dumper == NULL) {
                RTE_LOG(ERR, PMD, "Couldn't open %s for writing.\n",
                        pcap_filename);
                return -1;
        }

        return 0;
}

static int
open_single_rx_pcap(const char *pcap_filename, pcap_t **pcap)
{
        *pcap = pcap_open_offline(pcap_filename, errbuf);
        if (*pcap == NULL) {
                RTE_LOG(ERR, PMD, "Couldn't open %s: %s\n", pcap_filename,
                        errbuf);
                return -1;
        }

        return 0;
}

static int
eth_dev_start(struct rte_eth_dev *dev)
{
        unsigned int i;
        struct pmd_internals *internals = dev->data->dev_private;
        struct pcap_tx_queue *tx;
        struct pcap_rx_queue *rx;

        /* Special iface case. Single pcap is open and shared between tx/rx. */
        if (internals->single_iface) {
                tx = &internals->tx_queue[0];
                rx = &internals->rx_queue[0];

                if (!tx->pcap && strcmp(tx->type, ETH_PCAP_IFACE_ARG) == 0) {
                        if (open_single_iface(tx->name, &tx->pcap) < 0)
                                return -1;
                        rx->pcap = tx->pcap;
                }
                goto status_up;
        }

        /* If not open already, open tx pcaps/dumpers */
        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                tx = &internals->tx_queue[i];

                if (!tx->dumper &&
                                strcmp(tx->type, ETH_PCAP_TX_PCAP_ARG) == 0) {
                        if (open_single_tx_pcap(tx->name, &tx->dumper) < 0)
                                return -1;
                } else if (!tx->pcap &&
                                strcmp(tx->type, ETH_PCAP_TX_IFACE_ARG) == 0) {
                        if (open_single_iface(tx->name, &tx->pcap) < 0)
                                return -1;
                }
        }

        /* If not open already, open rx pcaps */
        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                rx = &internals->rx_queue[i];

                if (rx->pcap != NULL)
                        continue;

                if (strcmp(rx->type, ETH_PCAP_RX_PCAP_ARG) == 0) {
                        if (open_single_rx_pcap(rx->name, &rx->pcap) < 0)
                                return -1;
                } else if (strcmp(rx->type, ETH_PCAP_RX_IFACE_ARG) == 0) {
                        if (open_single_iface(rx->name, &rx->pcap) < 0)
                                return -1;
                }
        }

status_up:
        dev->data->dev_link.link_status = ETH_LINK_UP;

        return 0;
}

/*
 * This function gets called when the current port gets stopped.
 * Is the only place for us to close all the tx streams dumpers.
 * If not called the dumpers will be flushed within each tx burst.
 */
static void
eth_dev_stop(struct rte_eth_dev *dev)
{
        unsigned int i;
        struct pmd_internals *internals = dev->data->dev_private;
        struct pcap_tx_queue *tx;
        struct pcap_rx_queue *rx;

        /* Special iface case. Single pcap is open and shared between tx/rx. */
        if (internals->single_iface) {
                tx = &internals->tx_queue[0];
                rx = &internals->rx_queue[0];
                pcap_close(tx->pcap);
                tx->pcap = NULL;
                rx->pcap = NULL;
                goto status_down;
        }

        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                tx = &internals->tx_queue[i];

                if (tx->dumper != NULL) {
                        pcap_dump_close(tx->dumper);
                        tx->dumper = NULL;
                }

                if (tx->pcap != NULL) {
                        pcap_close(tx->pcap);
                        tx->pcap = NULL;
                }
        }

        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                rx = &internals->rx_queue[i];

                if (rx->pcap != NULL) {
                        pcap_close(rx->pcap);
                        rx->pcap = NULL;
                }
        }

status_down:
        dev->data->dev_link.link_status = ETH_LINK_DOWN;
}

static int
eth_dev_configure(struct rte_eth_dev *dev __rte_unused)
{
        return 0;
}

static void
eth_dev_info(struct rte_eth_dev *dev,
                struct rte_eth_dev_info *dev_info)
{
        struct pmd_internals *internals = dev->data->dev_private;

        dev_info->driver_name = drivername;
        dev_info->if_index = internals->if_index;
        dev_info->max_mac_addrs = 1;
        dev_info->max_rx_pktlen = (uint32_t) -1;
        dev_info->max_rx_queues = dev->data->nb_rx_queues;
        dev_info->max_tx_queues = dev->data->nb_tx_queues;
        dev_info->min_rx_bufsize = 0;
        dev_info->pci_dev = NULL;
}

static void
eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
{
        unsigned int i;
        unsigned long rx_packets_total = 0, rx_bytes_total = 0;
        unsigned long tx_packets_total = 0, tx_bytes_total = 0;
        unsigned long tx_packets_err_total = 0;
        const struct pmd_internals *internal = dev->data->dev_private;

        for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
                        i < dev->data->nb_rx_queues; i++) {
                stats->q_ipackets[i] = internal->rx_queue[i].rx_stat.pkts;
                stats->q_ibytes[i] = internal->rx_queue[i].rx_stat.bytes;
                rx_packets_total += stats->q_ipackets[i];
                rx_bytes_total += stats->q_ibytes[i];
        }

        for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
                        i < dev->data->nb_tx_queues; i++) {
                stats->q_opackets[i] = internal->tx_queue[i].tx_stat.pkts;
                stats->q_obytes[i] = internal->tx_queue[i].tx_stat.bytes;
                stats->q_errors[i] = internal->tx_queue[i].tx_stat.err_pkts;
                tx_packets_total += stats->q_opackets[i];
                tx_bytes_total += stats->q_obytes[i];
                tx_packets_err_total += stats->q_errors[i];
        }

        stats->ipackets = rx_packets_total;
        stats->ibytes = rx_bytes_total;
        stats->opackets = tx_packets_total;
        stats->obytes = tx_bytes_total;
        stats->oerrors = tx_packets_err_total;
}

static void
eth_stats_reset(struct rte_eth_dev *dev)
{
        unsigned int i;
        struct pmd_internals *internal = dev->data->dev_private;

        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                internal->rx_queue[i].rx_stat.pkts = 0;
                internal->rx_queue[i].rx_stat.bytes = 0;
        }

        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                internal->tx_queue[i].tx_stat.pkts = 0;
                internal->tx_queue[i].tx_stat.bytes = 0;
                internal->tx_queue[i].tx_stat.err_pkts = 0;
        }
}

static void
eth_dev_close(struct rte_eth_dev *dev __rte_unused)
{
}

static void
eth_queue_release(void *q __rte_unused)
{
}

static int
eth_link_update(struct rte_eth_dev *dev __rte_unused,
                int wait_to_complete __rte_unused)
{
        return 0;
}

static int
eth_rx_queue_setup(struct rte_eth_dev *dev,
                uint16_t rx_queue_id,
                uint16_t nb_rx_desc __rte_unused,
                unsigned int socket_id __rte_unused,
                const struct rte_eth_rxconf *rx_conf __rte_unused,
                struct rte_mempool *mb_pool)
{
        struct pmd_internals *internals = dev->data->dev_private;
        struct pcap_rx_queue *pcap_q = &internals->rx_queue[rx_queue_id];

        pcap_q->mb_pool = mb_pool;
        dev->data->rx_queues[rx_queue_id] = pcap_q;
        pcap_q->in_port = dev->data->port_id;

        return 0;
}

static int
eth_tx_queue_setup(struct rte_eth_dev *dev,
                uint16_t tx_queue_id,
                uint16_t nb_tx_desc __rte_unused,
                unsigned int socket_id __rte_unused,
                const struct rte_eth_txconf *tx_conf __rte_unused)
{
        struct pmd_internals *internals = dev->data->dev_private;

        dev->data->tx_queues[tx_queue_id] = &internals->tx_queue[tx_queue_id];

        return 0;
}

static const struct eth_dev_ops ops = {
        .dev_start = eth_dev_start,
        .dev_stop = eth_dev_stop,
        .dev_close = eth_dev_close,
        .dev_configure = eth_dev_configure,
        .dev_infos_get = eth_dev_info,
        .rx_queue_setup = eth_rx_queue_setup,
        .tx_queue_setup = eth_tx_queue_setup,
        .rx_queue_release = eth_queue_release,
        .tx_queue_release = eth_queue_release,
        .link_update = eth_link_update,
        .stats_get = eth_stats_get,
        .stats_reset = eth_stats_reset,
};

/*
 * Function handler that opens the pcap file for reading a stores a
 * reference of it for use it later on.
 */
static int
open_rx_pcap(const char *key, const char *value, void *extra_args)
{
        unsigned int i;
        const char *pcap_filename = value;
        struct pmd_devargs *rx = extra_args;
        pcap_t *pcap = NULL;

        for (i = 0; i < rx->num_of_queue; i++) {
                if (open_single_rx_pcap(pcap_filename, &pcap) < 0)
                        return -1;

                rx->queue[i].pcap = pcap;
                rx->queue[i].name = pcap_filename;
                rx->queue[i].type = key;
        }

        return 0;
}

/*
 * Opens a pcap file for writing and stores a reference to it
 * for use it later on.
 */
static int
open_tx_pcap(const char *key, const char *value, void *extra_args)
{
        unsigned int i;
        const char *pcap_filename = value;
        struct pmd_devargs *dumpers = extra_args;
        pcap_dumper_t *dumper;

        for (i = 0; i < dumpers->num_of_queue; i++) {
                if (open_single_tx_pcap(pcap_filename, &dumper) < 0)
                        return -1;

                dumpers->queue[i].dumper = dumper;
                dumpers->queue[i].name = pcap_filename;
                dumpers->queue[i].type = key;
        }

        return 0;
}

/*
 * Opens an interface for reading and writing
 */
static inline int
open_rx_tx_iface(const char *key, const char *value, void *extra_args)
{
        const char *iface = value;
        struct pmd_devargs *tx = extra_args;
        pcap_t *pcap = NULL;

        if (open_single_iface(iface, &pcap) < 0)
                return -1;

        tx->queue[0].pcap = pcap;
        tx->queue[0].name = iface;
        tx->queue[0].type = key;

        return 0;
}

/*
 * Opens a NIC for reading packets from it
 */
static inline int
open_rx_iface(const char *key, const char *value, void *extra_args)
{
        unsigned int i;
        const char *iface = value;
        struct pmd_devargs *rx = extra_args;
        pcap_t *pcap = NULL;

        for (i = 0; i < rx->num_of_queue; i++) {
                if (open_single_iface(iface, &pcap) < 0)
                        return -1;
                rx->queue[i].pcap = pcap;
                rx->queue[i].name = iface;
                rx->queue[i].type = key;
        }

        return 0;
}

/*
 * Opens a NIC for writing packets to it
 */
static int
open_tx_iface(const char *key, const char *value, void *extra_args)
{
        unsigned int i;
        const char *iface = value;
        struct pmd_devargs *tx = extra_args;
        pcap_t *pcap;

        for (i = 0; i < tx->num_of_queue; i++) {
                if (open_single_iface(iface, &pcap) < 0)
                        return -1;
                tx->queue[i].pcap = pcap;
                tx->queue[i].name = iface;
                tx->queue[i].type = key;
        }

        return 0;
}

static int
pmd_init_internals(const char *name, const unsigned int nb_rx_queues,
                const unsigned int nb_tx_queues,
                struct pmd_internals **internals,
                struct rte_eth_dev **eth_dev)
{
        struct rte_eth_dev_data *data = NULL;
        unsigned int numa_node = rte_socket_id();

        RTE_LOG(INFO, PMD, "Creating pcap-backed ethdev on numa socket %u\n",
                numa_node);

        /* now do all data allocation - for eth_dev structure
         * and internal (private) data
         */
        data = rte_zmalloc_socket(name, sizeof(*data), 0, numa_node);
        if (data == NULL)
                goto error;

        *internals = rte_zmalloc_socket(name, sizeof(**internals), 0,
                        numa_node);
        if (*internals == NULL)
                goto error;

        /* reserve an ethdev entry */
        *eth_dev = rte_eth_dev_allocate(name);
        if (*eth_dev == NULL)
                goto error;

        /* now put it all together
         * - store queue data in internals,
         * - store numa_node info in eth_dev
         * - point eth_dev_data to internals
         * - and point eth_dev structure to new eth_dev_data structure
         */
        data->dev_private = *internals;
        data->port_id = (*eth_dev)->data->port_id;
        snprintf(data->name, sizeof(data->name), "%s", (*eth_dev)->data->name);
        data->nb_rx_queues = (uint16_t)nb_rx_queues;
        data->nb_tx_queues = (uint16_t)nb_tx_queues;
        data->dev_link = pmd_link;
        data->mac_addrs = &eth_addr;

        /*
         * NOTE: we'll replace the data element, of originally allocated
         * eth_dev so the rings are local per-process
         */
        (*eth_dev)->data = data;
        (*eth_dev)->dev_ops = &ops;
        (*eth_dev)->driver = NULL;
        data->dev_flags = RTE_ETH_DEV_DETACHABLE;
        data->kdrv = RTE_KDRV_NONE;
        data->drv_name = drivername;
        data->numa_node = numa_node;

        return 0;

error:
        rte_free(data);
        rte_free(*internals);

        return -1;
}

static int
eth_from_pcaps_common(const char *name, struct pmd_devargs *rx_queues,
                const unsigned int nb_rx_queues, struct pmd_devargs *tx_queues,
                const unsigned int nb_tx_queues, struct rte_kvargs *kvlist,
                struct pmd_internals **internals, struct rte_eth_dev **eth_dev)
{
        struct rte_kvargs_pair *pair = NULL;
        unsigned int k_idx;
        unsigned int i;

        /* do some parameter checking */
        if (rx_queues == NULL && nb_rx_queues > 0)
                return -1;
        if (tx_queues == NULL && nb_tx_queues > 0)
                return -1;

        if (pmd_init_internals(name, nb_rx_queues, nb_tx_queues, internals,
                        eth_dev) < 0)
                return -1;

        for (i = 0; i < nb_rx_queues; i++) {
                struct pcap_rx_queue *rx = &(*internals)->rx_queue[i];
                struct devargs_queue *queue = &rx_queues->queue[i];

                rx->pcap = queue->pcap;
                snprintf(rx->name, sizeof(rx->name), "%s", queue->name);
                snprintf(rx->type, sizeof(rx->type), "%s", queue->type);
        }

        for (i = 0; i < nb_tx_queues; i++) {
                struct pcap_tx_queue *tx = &(*internals)->tx_queue[i];
                struct devargs_queue *queue = &tx_queues->queue[i];

                tx->dumper = queue->dumper;
                tx->pcap = queue->pcap;
                snprintf(tx->name, sizeof(tx->name), "%s", queue->name);
                snprintf(tx->type, sizeof(tx->type), "%s", queue->type);
        }

        for (k_idx = 0; k_idx < kvlist->count; k_idx++) {
                pair = &kvlist->pairs[k_idx];
                if (strstr(pair->key, ETH_PCAP_IFACE_ARG) != NULL)
                        break;
        }

        if (pair == NULL)
                (*internals)->if_index = 0;
        else
                (*internals)->if_index = if_nametoindex(pair->value);

        return 0;
}

static int
eth_from_pcaps(const char *name, struct pmd_devargs *rx_queues,
                const unsigned int nb_rx_queues, struct pmd_devargs *tx_queues,
                const unsigned int nb_tx_queues, struct rte_kvargs *kvlist,
                int single_iface, unsigned int using_dumpers)
{
        struct pmd_internals *internals = NULL;
        struct rte_eth_dev *eth_dev = NULL;
        int ret;

        ret = eth_from_pcaps_common(name, rx_queues, nb_rx_queues,
                tx_queues, nb_tx_queues, kvlist, &internals, &eth_dev);

        if (ret < 0)
                return ret;

        /* store weather we are using a single interface for rx/tx or not */
        internals->single_iface = single_iface;

        eth_dev->rx_pkt_burst = eth_pcap_rx;

        if (using_dumpers)
                eth_dev->tx_pkt_burst = eth_pcap_tx_dumper;
        else
                eth_dev->tx_pkt_burst = eth_pcap_tx;

        return 0;
}

static int
pmd_pcap_probe(const char *name, const char *params)
{
        unsigned int is_rx_pcap = 0, is_tx_pcap = 0;
        struct rte_kvargs *kvlist;
        struct pmd_devargs pcaps = {0};
        struct pmd_devargs dumpers = {0};
        int single_iface = 0;
        int ret;

        RTE_LOG(INFO, PMD, "Initializing pmd_pcap for %s\n", name);

        gettimeofday(&start_time, NULL);
        start_cycles = rte_get_timer_cycles();
        hz = rte_get_timer_hz();

        kvlist = rte_kvargs_parse(params, valid_arguments);
        if (kvlist == NULL)
                return -1;

        /*
         * If iface argument is passed we open the NICs and use them for
         * reading / writing
         */
        if (rte_kvargs_count(kvlist, ETH_PCAP_IFACE_ARG) == 1) {

                ret = rte_kvargs_process(kvlist, ETH_PCAP_IFACE_ARG,
                                &open_rx_tx_iface, &pcaps);

                if (ret < 0)
                        goto free_kvlist;

                dumpers.queue[0] = pcaps.queue[0];

                single_iface = 1;
                pcaps.num_of_queue = 1;
                dumpers.num_of_queue = 1;

                goto create_eth;
        }

        /*
         * We check whether we want to open a RX stream from a real NIC or a
         * pcap file
         */
        pcaps.num_of_queue = rte_kvargs_count(kvlist, ETH_PCAP_RX_PCAP_ARG);
        if (pcaps.num_of_queue)
                is_rx_pcap = 1;
        else
                pcaps.num_of_queue = rte_kvargs_count(kvlist,
                                ETH_PCAP_RX_IFACE_ARG);

        if (pcaps.num_of_queue > RTE_PMD_PCAP_MAX_QUEUES)
                pcaps.num_of_queue = RTE_PMD_PCAP_MAX_QUEUES;

        if (is_rx_pcap)
                ret = rte_kvargs_process(kvlist, ETH_PCAP_RX_PCAP_ARG,
                                &open_rx_pcap, &pcaps);
        else
                ret = rte_kvargs_process(kvlist, ETH_PCAP_RX_IFACE_ARG,
                                &open_rx_iface, &pcaps);

        if (ret < 0)
                goto free_kvlist;

        /*
         * We check whether we want to open a TX stream to a real NIC or a
         * pcap file
         */
        dumpers.num_of_queue = rte_kvargs_count(kvlist, ETH_PCAP_TX_PCAP_ARG);
        if (dumpers.num_of_queue)
                is_tx_pcap = 1;
        else
                dumpers.num_of_queue = rte_kvargs_count(kvlist,
                                ETH_PCAP_TX_IFACE_ARG);

        if (dumpers.num_of_queue > RTE_PMD_PCAP_MAX_QUEUES)
                dumpers.num_of_queue = RTE_PMD_PCAP_MAX_QUEUES;

        if (is_tx_pcap)
                ret = rte_kvargs_process(kvlist, ETH_PCAP_TX_PCAP_ARG,
                                &open_tx_pcap, &dumpers);
        else
                ret = rte_kvargs_process(kvlist, ETH_PCAP_TX_IFACE_ARG,
                                &open_tx_iface, &dumpers);

        if (ret < 0)
                goto free_kvlist;

create_eth:
        ret = eth_from_pcaps(name, &pcaps, pcaps.num_of_queue, &dumpers,
                dumpers.num_of_queue, kvlist, single_iface, is_tx_pcap);

free_kvlist:
        rte_kvargs_free(kvlist);

        return ret;
}

static int
pmd_pcap_remove(const char *name)
{
        struct rte_eth_dev *eth_dev = NULL;

        RTE_LOG(INFO, PMD, "Closing pcap ethdev on numa socket %u\n",
                        rte_socket_id());

        if (name == NULL)
                return -1;

        /* reserve an ethdev entry */
        eth_dev = rte_eth_dev_allocated(name);
        if (eth_dev == NULL)
                return -1;

        rte_free(eth_dev->data->dev_private);
        rte_free(eth_dev->data);

        rte_eth_dev_release_port(eth_dev);

        return 0;
}

static struct rte_vdev_driver pmd_pcap_drv = {
        .probe = pmd_pcap_probe,
        .remove = pmd_pcap_remove,
};

RTE_PMD_REGISTER_VDEV(net_pcap, pmd_pcap_drv);
RTE_PMD_REGISTER_ALIAS(net_pcap, eth_pcap);
RTE_PMD_REGISTER_PARAM_STRING(net_pcap,
        ETH_PCAP_RX_PCAP_ARG "=<string> "
        ETH_PCAP_TX_PCAP_ARG "=<string> "
        ETH_PCAP_RX_IFACE_ARG "=<ifc> "
        ETH_PCAP_TX_IFACE_ARG "=<ifc> "
        ETH_PCAP_IFACE_ARG "=<ifc>");